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Mathematics

Trapezoid Perimeter Calculator

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Variable Legend

a= shorter parallel baseb= longer parallel basec= left legd= right legP= perimeter

Perimeter

Add all four sides together.

Perimeter

Missing side

Rearrange to find any unknown side.

Find a
Find b
Find c
Find d

Isosceles trapezoid

When both legs are equal (c = d).

Deep Dive

Read the full guide on how to use this calculator effectively

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Mathematically verified
Reviewed June 2026
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